According to Wikipedia, Major-General MacGregor “ was an Anglo-Indian explorer, geographer and officer of the British Indian Army. He was the Quartermaster General for the British Army in India, the head of the Intelligence Department for the British Indian Army and served under Frederick Roberts in the Second and Third Anglo-Afghan Wars. The MacGregor Medal is awarded in his honour.” His Defence of India: a Strategical Study (1884) “attempted to alert the British public to the geo-strategic importance of India, and the threat posed to British interests by Russia.” His bust rests on representations of this and his other books.

Salvatore Albano (1841-93) was an Italian sculptor who had his studio in Florence from the late 1870s (see Dearinger 11). In the St Paul's Collections site, "F. Firenze" is given as another sculptor, but this is probably the place rather than an indication of a collaboration.

Photographs 2011 and formatting by George P. Landow. Text by Landow and Jacqueline Banerjee. With thanks to the Dean and Chapter of St Paul’s Cathedral. You may use these images without prior permission for any scholarly or educational purpose as long as you (1) credit the photographer and (2) link your document to this URL in a web document or cite the Victorian Web in a print one.]

Source

Dearinger, David Bernard, ed. Paintings and Sculpture in the Collection of the National Academy of Design. Manchester, VT: Hudson Hills, 2004.